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CFD simulation of hydrochloric acid regeneration with a Ruthner process
2010 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A process at SSAB regenerates waste hydrochloric acid (HCl), from the pickling process, with the spray roasting technique. Waste HCl acid is sprayed into a hot chamber where the water in the droplets is evaporated then a chemical process when iron chlorides is oxidized to form hematite and HCl gas. The regenerated HCl is sent to the process for steel pickling and the hematite powder is sold. With a good quality of the powder the process is ran with profit. But today they have problem to control quality. Because of the aggressive environment inside this process the furnace is closet which makes it hard to do measurements inside the process. To get an impression of the velocity profile and temperature distribution it is therefor a good idea to simulate the process. This project aims to, raise the knowledge about the process. By Computational Fluid Dynamic (CFD) simulations in the commercial software Ansys CFX the present study will explain temperature distri- bution, velocity profiles, particle distribution and how the evaporation process changes when nozzle position and angle is changed. Results shows that the temperature is highest close to the wall and decreases in the region 40-100cm from the wall and the temperature is almost constant close to center. These results has also been compared with measurements. Results further shows that the evaporation process is dependent of position and angle of the nozzle. Where position has a larger impact on the rate of evaporation.

Place, publisher, year, edition, pages
Keyword [en]
Technology, CFX, CFD, Acid Regeneration, Ruthner Process, Spray Roaster, SSAB
Keyword [sv]
URN: urn:nbn:se:ltu:diva-51321ISRN: LTU-EX--10/144--SELocal ID: 8872586c-561d-438d-8253-cd16e5b42728OAI: diva2:1024682
Subject / course
Student thesis, at least 30 credits
Educational program
Engineering Physics, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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